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4.5.
3.
Go
To
Local
(GTL)
4. 5. 3.
2.1
Provided
the
counter
is
in
remote
and
a
listener,
it
reverts
to
local
operation.
The
counter
remains
addressed
to listen.
It
now
operates by front-panel
controls,
until
returned
to
remote
control by receipt of the
first
byte
of a
device-
dependent message. The decimal and hex
equivalents are
both
01.
4. 5. 3.
3
Selected
Device Clear (SDC)
4.
5. 3.
3.1
Provided
the
counter
is
in
remote
and a
listener,
it
reverts
to
home
state.
The
condition
of
the
GPIB
interface
remains unchanged.
The decimal
and hex
equivalents are both
04.
4.5.
3.4
Group
Execute Trigger (GET)
4.
5.3. 4.1
Provided
the
counter
is
a
listener
and no
measurement
is
in
progress,
it
triggers
a previously
programmed
measurement. The
GET
command
permits
several bus
devices
to
simultaneously
perform
a
number
of different operations.
(All
bus
members
have been
previously
programmed
to
perform
a
function
on
receiving the
GET
command
or trigger
command.) The decimal
and
hex
equivalents are
both
08.
4.5.3.5
Local Lockout
(LLO)
4.
5. 3.
5.1
The
counter
responds
to
the
LLO command
regardless of
its
addressed
state.
The
LLO
command
disables the
LOCAL
key on
the front
panel.
Local lockout
is
cleared by sending
the
REN
message
as
false,
returning
all
bus devices
to
the local
control
state.
A GTL command
returns the
counter
to local control.
The
decimal and
hex
equivalents are 17
and
11,
respectively.
4.5.3.6
Device
Clear
(DCD
4. 5.3. 6.1
Same
as
the
SDC
command,
except
that
all
bus devices
in
remote
are
cleared.
The
counter responds
to
this
command
regardless of
its
addressed
state.
The
decimal and hex
equivalents
are 10 and
14, respectively.
4.5. 3. 7
Serial Poll
Enable (SPE)
4. 5.3. 7.1
This
command
permits
all
bus
members,
including the counter,
to set their
SRQ
line
to
binary
1,
informing
the controller that attention
is
required.
The
1994
responds
to this
command
regardless of
its
addressed
state.
Each
bus
member,
having
been
made
a
talker,
is
then
serially
interrogated by the controller
to
determine which
bus
m
ember
(s)
requested
service
and
the
purpose
of
each
request.
Bus
members
respond by
transmitting
their
respective status bytes
to
the controller.
All
members
respond
to
the
SPE
regardless of
their
addressed
state.
The hex
and decimal
equivalents are 18
and
24,
respectively.
4.5.3.8
Serial Poll
Disable
(SPD)
4. 5.3.
8.1
This
command
returns
all
bus
members
to
normal
operation
after
completion
of a
serial poll.
All
bus
members
respond
to
the
SPD command
regardless of
their
addressed
state.
If
addressed
to
talk,
a bus device
will
put
its
data output
string
on
the
GPIB,
provided such data
is
available
in
its
output
buffer.
The decimal and hex
equivalents are 25
and
19,
respectively.
4-19
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